Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Charge substitutions generated by site-directed mutagenesis at the termini of adjacent anti-parallel alpha-helices in a four-helix bundle protein were used to determine a precise value for the contribution of indirect charge-charge interactions to overall protein stability, and to simulate the electrostatic effects of…
We have measured the inelastic electron scattering spectra of a variety of Si and SiO2 thin films from the fundamental absorption threshold to well above the L-shell thresholds. We have used Kramers–Kronig analyses and sum rules to obtain the dielectric and optical response functions. We compare the optical properties…
We study a system of hard spherocylinders in contact with a hard wall, assuming that the length-to-width ratio of the spherocylinder tends to infinity. The Onsager approximation is applied to calculate the free energy of the system. The integral equation for the one-particle distribution function is solved in the unia…
Recent research into using offline and online diagnostics to study ageing of generator insulation is discussed. Preventive maintenance based on offline diagnostic methods and adequate updating of windings are reviewed. A few examples of online partial discharge measurements and sensor designs of and concepts under dev…
An improved algorithm is described for automated structure-factor refinement using convergent-beam electron diffraction patterns. In addition to refinement of structure factors, absorption coefficients and sample thickness, the new algorithm includes beam-direction refinement, the inclusion of weak-beam effects using…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of electronically excited copper(II)-porphyrin with oligo- and polynucleotides: exciplex building process by photoinitiated axial ligation of porphyrin to thymine and uracil residuesPeter Mojzes, Laurent Chinsky, and Pierre Yves TurpinCite this: J. Phys. Chem. 19…
A Herzberg–Teller expansion for π electrons in the ground state of conjugated polymers identifies quadratic electron–phonon (e–ph) contributions and suggests a σ+π reference force field F0 based on butadiene. Linear response theory then fixes linear e–ph coupling constants for the Raman shifts in polyacetylene (PA) du…
Using an iterative method modernized with the adaptive subadjustment, we calculated phase functions of the focusators into a longitudinal axial line-segment, which is characterized by the constant light intensity along the line. Numerical studies were performed of a focal area: a character of variations of both the tr…
Abstract In situ surface enhanced Raman spectra (SERS) of adsorbed oxygen were obtained during oxygen adsorption and ethylene epoxidation on Ag catalyst surfaces at temperatures between 25 and 400 °C and atmospheric total pressure. Three types of Ag catalysts were investigated: (I) Ag supported on a ‐Al 2 O 3 , (II) A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of halogens with laser-ablated boron: infrared spectra of BXn (X = F, Cl, Br, I; n = 1, 2, 3) in solid argonParviz Hassanzadeh and Lester AndrewsCite this: J. Phys. Chem. 1993, 97, 19, 4910–4915Publication Date (Print):May 1, 1993Publication History Published online…
The stratification dynamics of thin circular horizontal soap films was studied experimentally. A series of metastable circular stratification domains with different thicknesses were observed. Bubble-form instabilities of Rayleigh's type always appear at the borders of the thinnest domains. It has been found that the d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and stability of poly(3,4-dibutoxythiophenevinylene) copolymersMargaret L. Blohm, James E. Pickett, and Paul C. Van DortCite this: Macromolecules 1993, 26, 11, 2704–2710Publication Date (Print):May 1, 1993Publication History Published online1 May…
Photoinduced and thermally induced bleachings of as-deposited GexS100−x and (Ge0.3S0.7)100−yAgy films were systematically studied in the ranges of 21≤x≤42 and 0≤y≤67 using optical transmission measurement. The bleachings for the Ge-S system show a maximum at around the stoichiometric composition GeS2, whereas that for…
The thermodynamic constraint relating the standard free energy of formation of an oxide (MO c ) to its oxygen potentials by Δ G f 0 (MO c ) =½ƒ o c Δ Ḡ (O 2 ) d C ′ has been used to develop the full spectrum of oxygen potentials of the U─O and Zr─O systems at high temperatures. Henry's law is applied to the metal regi…
A systematic study of cobalt site preferences has been carried out in a number of rare-earth iron compounds. The M\"ossbauer source technique employed in this work offers a direct and unambiguous way to determine quantitatively cobalt site preferences in these compounds at extremely low cobalt contents. Data quality a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe surface tension of polymer blends: theory and experimentGregory T. Dee and Bryan B. SauerCite this: Macromolecules 1993, 26, 11, 2771–2778Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 May 1993https://pubs.acs.org/do…
We performed extensive Monte Carlo simulations of a hard-sphere f.c.c. crystal near the melting transition in order to examine the validity of the widely used Gaussian ansatz for the density distribution in solids. Anisotropic deviations in the shape of the density distribution from the Gaussian form are found to be o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of Rh[P(CH3)3]2(CO)CH3 and Rh[P(CH3)3]2(CO)PhSue E. Boyd, Leslie D. Field, Trevor W. Hambley, and Martin G. PartridgeCite this: Organometallics 1993, 12, 5, 1720–1724Publication Date (Print):May 1, 1993Publication History Published online1 May…
From low-iron cultures of Vibrio fluvialis AQ 0012, two new compounds with siderophore activity were purified by XAD-7 adsorption followed by preparative TLC. Norspermidine and 2,3-dihydroxybenzoic acid were identified as constituents common to both compounds by GC-MS analyses of their acid hydrolytic products. In add…
A chemical synthesis process for producing high-quality Si[sub 3]N[sub 4] powder was developed by applying an imide decomposition method and well-controlled heat-treatment to the crystallization process. Si[sub 3]N[sub 4] powder produced by this process had superior characteristics, such as high purity, fine particle,…